US PATENT SUBCLASS 528 / 62
.~.~.~.~ Organic NH, =NH, or HNH nitrogen-containing reactant contains a heterocyclic ring

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528 /   HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {23}
44  DF  .~ FROM REACTANT HAVING AT LEAST ONE -N=C=X GROUP (WHEREIN X IS A CHALCOGEN ATOM) AS WELL AS PRECURSORS THEREOF, E.G., BLOCKED ISOCYANATE, ETC. {17}
59  DF  .~.~ From N=C=X reactant having at least two -C-NH-C(=X)- groups {3}
61  DF  .~.~.~ With organic nitrogen reactant which contains two NH, =NH, or HNH groups {3}
62.~.~.~.~ Organic NH, =NH, or HNH nitrogen-containing reactant contains a heterocyclic ring

DEFINITION

Classification: 528/62

(under subclass 61) Subject matter wherein the reactant which contains two -NH, =NH, or -NH2 groups also contains a heterocyclic ring.

SEE OR SEARCH CLASS

520, Synthetic Resins or Natural Rubbers, see the Glossary for a definition of the term "heterocyclic".